| 摘要 |
A wellbore tool, such as a cementing tool, configured for placement in a wellbore or drill string. and method of sealing the tool in the wellbore or drill string. The tool is lowered on a stern into the wellbore or drill string and contacts a downhole obstacle (the bit when lowered in a drill string), such that the downward pressure on the tool causes a shear pin to shear, resulting in upward movement of an outer sleeve relative to the central body of the tool. The outer sleeve, when upwardly displaced, pushes against a deformable sleeve. and the deformable sleeve then presses outwardly against the inner walls of the wellbore or drill string, scaling the tool therein. The deformable sleeve can be directed outwardly by contacting it during upward displacement of the outer sleeve with an angled surface of the central body. |
